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Caffeine (/kæfin, kæfin, kæfin/) is a bitter, white crystalline xanthine alkaloid found in the parts of certain plants. The caffeine ingested by insects when they feed on these parts functions as a natural pesticide that can paralyze and kill them. It can also enhance the reward memory of pollinators such as honey bees.
Caffeine is found in the seeds of the coffee plant; the leaves of the tea bush; and in kola nuts, the usual source of caffeine as an additive for various foods ...